Apparatus for forming pipe-molds.



J. l(.. DIMMIGK. APPARATUS FOR FORMING PIPE HOLDS.

(Application filed Dec. 97, 1900.) (No Model.) 2 Sheets-Sheet I.

No. 683,255. Patented Sept. 24, I90].

No. 683,255. Patented Sept. 24, 190i. J. K. DIMMICK. V v

APPARATUS FOR FORMING PIPE MOLDS.

(Application filed Dec. 27, 1900.) (No Iodel.) 2 Sheets-Sheet 2.

UNITED STATES PATENT OFFICE.

JACOB K. DIMMICK, OF PHILADELPHIA, PENNSYLVANIA.

APPARATUS FOR FORMING PlPE-MOLDS.

SPECIFICATION forming part of Letters Patent No. 683,255 dated September 24, 1901.

Application filed December 27, 1900. Serial No. 41,187. (No model.)

T at whom it may concern:

Be it known that I, JACOB K. DIMMIOK, a citizen of the United States, and a resident of the city of Philadelphia, State of Pennsyl- Vania, have invented certain new and useful Improvements in Apparatus for Forming Pipe-Molds, of which the following is a full, clear, and exact description, reference being had'to the accompanying drawings, forming part of this specification.

My invention relates to certain improvements in apparatus for forming molds for casting metallic pipes; and it consists in the structural features substantially as herein described.

The principal object of my invention is to provide means for evenly compressing the molding-sand in the flask without resorting to the ramming process and to provide improved means for centering the pattern in the flask and for guiding the same during its withdrawal.

A further object of my invention is to provide an improved construction of supportingbase for the flask having a removable guideplate and means forsecuring the same in position and a removable core-plate for supporting and centering the core during casting.

In the accompanying drawings, which form a part of this specification, and in which similar numerals of reference are used to indicate similar parts, Figure 1 is a sectional e1eva tion of an apparatus embodying my improvements, the former or pattern being shown in position in the flask and ready for withdrawal. Fig. 2 is a plan view illustrating my improved means for centering and guiding the pattern during the forming process. Fig. 3 is a sectional elevation of the lower portion of the flask, illustrating the core in position on its removable seat-plate. Fig. 4is a bottom plan view of the same.

In carrying out my invention I employ a cylindrical flask 1, which is preferably made in two longitudinal sections hinged together at one of their meeting edges and secured by means of removable clamps at the other, so that it may be readily opened when it is desired to remove the mold after use. This feature is well known in this art and forms no part of my invention. Hence I have not deemed it necessary to illustrate the same.

The former or pattern 2 is substantially cylindrical in form and has formed integral with its upper portion an enlarged section 3, which is largerin diameter than the intermediate section 4. of said pattern and of equal diameter with that of the lower section 5.

Between the sections at and 5 is a tapering or flaring section 6, the purpose of which will be hereinafter described. In the base 7, which is supported on suitable framework, (not illustrated,) I provide an aperture 8, into which is fitted a removable guide-plate 9, having a central bore of a size sulficient to neatly fit the lower section 5 of the pattern. This guide-plate 9 is provided with an annu lar flange 10 on its lower end, which bears against the base-plate 7, as illustrated in Fig. 1 of the drawings. In order to hold the said plate in position, I provide a projecting lug 11 on the under side of said plate, which bears against a projecting shoulder 12, formed on the interior of the base 7. On the opposite side of the guide-plate 9 I provide an outwardly-projecting tongue 13, which extends within a slot 14, provided in the wall of the base 7. A clamp 15, which may be of any suitable construction, embraces this tongue and the lower flange of the flask 1, and thus securely holds the guide-plate in place.

1 The lower section 5 of the pattern extends through the aperture formed in the guideplate 9 and is of a length equal to about onehalf thatof the section 4, the purpose of this being to steady and guide the lower portion of the patternduring its withdrawal from the flask and also to allow the incline or flaring portion 6 of the pattern to start at the bottom of the flask, so that in withdrawing this section 6 will startto compress the sand at the bottom of the flask, and thus prevent the necessity of ramming the sand around the lower section of said flask, as has been the case heretofore. The upper portion of the flask 1 terminates in a flaring head, and in this enlarged portion is placed the bell-pattern 16, this being inserted after the flask has been filled with sand and a seat for the said bell-pattern being roughly shaped by hand. This bell-pattern too 16 is provided with a central bore, which is slightly greaterin diameter than the diameter of the section 3 of the pattern 2 in order that the said section 3 may easily slide therethrough during withdrawal.

On the top of the flask l is a guide-plate 17, which may be secured to the said flask by means of clamps or any other suitable means. This plate 17 is provided with a central aperture into which fits the recess portion 18, formed in the upper edge of the bell-pattern 16. On the upper surface of this plate 17 I provide a series of pivoted fingers 19, theinner ends of which normally bear against the smaller section 4 of the pattern or former 2 and are for the purpose of centering and guiding the said pattern during its withdrawal, as will be described hereinafter. The outer ends of the fingers 19 are mounted on pivots 20, which are journaled in ears 21, formed on the top plate 17. A fiat curved spring 22 is provided above each of the fingers 19, having one end pivoted at 23 to the plate 17 and having their free ends bearing against the fingers 19 at a point adjacent to their inner ends. A pin 24 passes through the ears 21, directly above each of the springs 22, for the purpose of holding them down and exerting their tension against the pivoted fingers 19.

In forming the mold the pattern 2 is placed in position,the lower section 5 passing through the bore of the guide-plate 9 and the flaring portion 6, being located at the bottom of the flask, starting directly above the guide-plate. The flask is then filled with sand and a place for the bell-pattern 16 roughly shaped by hand in the upper enlarged portion of the flask and the said bell-pattern placed in position by slipping it over the enlarged section 3 of the pattern or former 2. After the bellpattern is placed in position sand is filled in around it and rammed or packed tightly and the top plate 17 put on and clamped in position by any suitable means. The springpressed fingers -19 will bear against the upper extending end of the pattern 2 and center the same, and the pattern is ready to be withdrawn. This may be accomplished by applying the necessary power to the ring 25, which is secured to the upper end of the former. During the withdrawal of the former or pattern the spring-pressed fingers 19 will be lifted, so as to permit the passage of the enlarged section 3; but their ends will always bear against the outer surface of the said former and guide the same. The flared section 6 will as the pattern iswithdrawn serve to compress and pack the sand tightly, and the lower section 5 of the said former will remain in the guide-plate and steady the said pattern until after about one-half of the mold has been compressed, and this compressed portion of the mold will guide the former and keep it from wabbling during the remainder of the withdrawing process. After the pattern 2 has been withdrawn from the flask and the mold thus evenly and firmly packed the core 26 is ready for insertion into the mold. In order to form a seat for the said core, the guide-plate 9 is removed and a seat-plate 27 fitted into the aperture 8, formed in the base 7, as illustrated in Fig. 3 of the drawings. This seat-plate 27 is provided with a central tapering aperture 28, into which fits the tapering end of the core 26. The plate 27 is also provided with a projeetinglug 29, similar in construction to the lug 11' on the guide-plate 9, which lug engages and is supported by the Shoulder 12, carried by the interior wall of the base 7. Atongue 30, similar to the tongue 13 on the guide-plate, is also provided on the seat-plate,which extends within the recess or slot 14: and isclamped by means of the clamp 31 to the flange of the flask 1. This seatplate can be very easily removed by removing the clamp 31 and pulling down the tongue 30 a short distance below the base 7 and then withdrawing the same laterally,which disengages the lug 29 from the shoulder 12. The removable guide-plate 9 is supported in the base 7 in substantially the same manner as the core seat-plate and is also removed in a similar manner.

From the foregoing description it will be readily seen that I have provided a simple and effective means for centering and guiding'the former or pattern at its upper end during its withdrawal from the flask and that by constructing my former in the manner described I am enabled to uniformly pack the entire length of the mold by simply withdrawing the former therefrom. The extended lower section 5 of the said former operating in the guide-plate 9 guides the lower section 1 of said former duringthe withdrawal operation and prevents the same from wabbling, thus obviating or preventing any irregularity which might be caused by lateral movement in the mold.

Having thus fully described my invention, what I claim, and desire to secure by Letters i Patent, is I 1. In a pipe-molding apparatus, the com bination with the flask of a movable former centrally located therein having an enlarged flaring compressing section near its lower end, an enlarged guide-section formed on the upper portion of the former, a bell-pattern having a central bore fitting the enlarged sections of the former, a guide-plate secured to the upper end of the flask adapted to hold and center the bell-pattern, and mechanism car= ried by the guide-plate for centering and guid ing the former during its withdrawal.

2. In a pipe-molding apparatus, the combination with the flask of a movable former centrally located therein having an enlarged flaring compressing-section near its lower end, an enlarged guide-section formed on the upper portion of the former, a bell-pattern having a central bore fitting the enlarged sections of the former, a guide-plate secured to the upper end of the flask adapted to hold and center the belI-pattern and mechanism carried by the said guide-plate for centering and guiding the former during its withdrawal and a removable guide-plate located in the flask-bottom having a central bore through which the lower section of the former passes, substantially as described.

3. In a pipe-molding apparatus, the combination with the flask, of a movable former centrally located therein, an enlarged section formed on the upper portion of the former, a bell-pattern having a central bore into which the collar of the former fits, a guide-plate adapted to the upper end of the flask having a central opening fortcentering and holding the bell -pattern, and a series of springpressed fingers adapted to bear against the sides of the former, for the purpose described.

4. The combination with the flask, of a movable former located therein, an enlarged section formed on the upper portion of said former, a bell-pattern having a central bore fitting the enlarged section of the former, a guide-plate secured to the upper end of the flask adapted to hold and center the bellpattern, and a series of radially-disposed yielding fingers pivoted to the guide-plate having their inner ends adapted to bear against the sides of the former, substantially as described.

5. The combination with the flask, of a movable former located therein, an enlarged section formed on the upper portion of said former, a bell-pattern having a central bore fitting the enlarged section of the former, a guide-plate secured to the upper end of the flask adapted to hold and center the bellpattern, a series of radially-disposed fingers pivoted at one end to the guide-plate having theirinner free ends bearing against the sides of the former, and springs adapted to bear against the upper faces of said pivoted fingers for keeping them in yielding contact with the former during its withdrawal, substantially as described.

6. In a pipe-molding apparatus, the combination of the flask, a removable former located in said flask, having its lower end extending through the bottom of same and adapted to be withdrawn to compress the sand, a removable guide-plate located in the flask-bottom having a central bore through which the lower section of the former passes, an outwardly-projecting lug formed on the bottom of the guide-plate, a shoulder carried by the inner wall of the flask-base adapted to support said lug, a projecting tongue formed on the opposite side of the guide-plate adapted to a recess in the said wall of the flask-base,- and a clamp for securing said tongue to the flask-frame, substantially as described.

, In witness whereof I have hereunto set my hand this 20th day of December, A. D. 1900.

JACOB K. DIMMICK. Witnessesi JOHN B. RUTHERFORD, HORACE PETTIT. 

